<template>
  <div id="app">
     <div class="box">
       <div class="left"></div>
       <div class="center"></div>
       <div class="right"></div>
     </div>
  </div>
</template>

<script>
import HelloWorld from './components/HelloWorld.vue'

export default {
  name: 'App',
  components: {
    HelloWorld
  }
}
</script>

<style lang="less" scoped>
#app {
  .box {
    display: flex;
    width: 100%;
    height: 100vh;
    flex: 1;
    .left {
      flex: 1;
      background-color: green;
    }
    .center {
      flex: 1;
      background-color: pink;
    }
    .right {
      flex: 1;
      background-color: yellow;
    }
  }
}
</style>
